From a1c9d89a98cbbc52ead6c44bb0c31eaaa37c5770 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 29 Mar 2010 21:33:28 -0700 Subject: net: Potential null skb->dev dereference [ Upstream commit 0641e4fbf2f824faee00ea74c459a088d94905fd ] When doing "ifenslave -d bond0 eth0", there is chance to get NULL dereference in netif_receive_skb(), because dev->master suddenly becomes NULL after we tested it. We should use ACCESS_ONCE() to avoid this (or rcu_dereference()) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/netdevice.h | 8 ++++---- net/8021q/vlan_core.c | 4 ++-- net/core/dev.c | 8 +++++--- 3 files changed, 11 insertions(+), 9 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 99914e6fa3fd..03e8d81a8391 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2023,12 +2023,12 @@ static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and * ARP on active-backup slaves with arp_validate enabled. */ -static inline int skb_bond_should_drop(struct sk_buff *skb) +static inline int skb_bond_should_drop(struct sk_buff *skb, + struct net_device *master) { - struct net_device *dev = skb->dev; - struct net_device *master = dev->master; - if (master) { + struct net_device *dev = skb->dev; + if (master->priv_flags & IFF_MASTER_ARPMON) dev->last_rx = jiffies; diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index e75a2f3b10af..152760a487e6 100644 --- a/net/8021q/vlan_core.c +++ b/net/8021q/vlan_core.c @@ -11,7 +11,7 @@ int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp, if (netpoll_rx(skb)) return NET_RX_DROP; - if (skb_bond_should_drop(skb)) + if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master))) goto drop; __vlan_hwaccel_put_tag(skb, vlan_tci); @@ -82,7 +82,7 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp, { struct sk_buff *p; - if (skb_bond_should_drop(skb)) + if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master))) goto drop; __vlan_hwaccel_put_tag(skb, vlan_tci); diff --git a/net/core/dev.c b/net/core/dev.c index ec874218b206..f51f940a077c 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2421,6 +2421,7 @@ int netif_receive_skb(struct sk_buff *skb) { struct packet_type *ptype, *pt_prev; struct net_device *orig_dev; + struct net_device *master; struct net_device *null_or_orig; int ret = NET_RX_DROP; __be16 type; @@ -2440,11 +2441,12 @@ int netif_receive_skb(struct sk_buff *skb) null_or_orig = NULL; orig_dev = skb->dev; - if (orig_dev->master) { - if (skb_bond_should_drop(skb)) + master = ACCESS_ONCE(orig_dev->master); + if (master) { + if (skb_bond_should_drop(skb, master)) null_or_orig = orig_dev; /* deliver only exact match */ else - skb->dev = orig_dev->master; + skb->dev = master; } __get_cpu_var(netdev_rx_stat).total++; -- cgit v1.2.2